Coenosia attenuata

Coenosia attenuata (also sometimes cited as Coenosia attenuate), commonly called "hunter fly," is a predatory fly native to Southern Europe. It was first discovered in the United States in 2001 by an Integrated Pest Management scout in a greenhouse in New York State. It has since been found throughout North and South America. Coenosia have shown promise as a biological control agent of fungus gnats, shore flies, and other common greenhouse pests.